Draw-gear and buffing apparatus.



No. 745,425. PA'rBNTEDDBal, 1903.

M. E. DAYTON. l DRAW GEAR. VAND Bul-PING APPARATUS. No MODEL4APPLIGAIIMI FILED SEPT. 30, 1903 ZVSHEETEWsH-BBT 1 uunms Prrsns sa, v

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A lf L. zii im WKITN ESSESv BATENTBD DEG. 1, 1903.'

l M. E'. DAYTON. DRAW GEAR AND BUPPING APPARATUS.

APPLICATION IILID SEPT. 30, 193. v N0 MDDEL.

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Wi'fll ESSES v UNITED STATES Fatentedv December 1, 1903.

PATENT OFFICE.

MELVILLE E. DAYTON, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR C TOTHE WESTINGHOUSE AIR BRAKE COMPANY, OF PITTSBURG, PENN- SYLVANIA, ACORPORATION OF PENNSYLVANIA.

DRAW-GEAR AND BUFFING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 745,425, dated December1, 1903.

Application filed September 30, 1903. Serial No. 175,121 (No model.)

To LZ whom t may concern.-

Be it known that LMnLvInLE EDAY'roN, of Vashington ,in the District ofColumbia, have invented a certain new and useful Improvement inDraw-,Gear and Bufflng Apparatus,

of whichimpro-vement the following is a speciiication.

My invention more particularly relates `to appliances of the classgenerally known as xo friction draft-gear, which areinterposed betweenthe coupler and the frame of a railroadcar for the purpose ofvtransmitting strains of draft and buiiing from the former to the latterand opposing and reducing said I5 strains in transmission by frictionalresistance.

The object of my invention is to provide an appliance of this classwhich shall be of sim- 'ple and Ainexpensive construction, of ready zoapplicability in car-frame constructions of.

the present standard types, and yin which a large amount of frictionalresistance surface may be presented within a comparatively smallcompass. z 5 The improvement claimed is hereinafter fully set forth.

In the accompanying drawings, Figure lis a vertical longitudinal centralsection through a draw-gear and bung apparatus, illustrating anapplication of my invention; Fig. 2, a horizontal section through thesame; Fig. 3, a section similar to that of Fig. 1, but on an enlargedscale, through the draw-bar strap, frictional elements, and followers;Fig. 4, a 3 5 view in diametral elevation of one of the nonresilientwedge-rings; Fig. 5, a transverse section through the same; Fig. 6', aview in diametral elevation of one of the inner springrings; Fig. 7, aview in side elevation of the 4o same; Fig. 8, a View in diametralelevation of one of the outer spring-rings, and Fig. 9 a View in sideelevation of the same.

My invention is herein exemplified as applied in connection with adraw-bar 1l of a railroad-car, which draw/bar is provided at its outerend with a coupler-head lEL and connected at and adjoining-its inner endto a draft strap or yoke 19, of the ordinary construction, the draw-barand draft-strap abutting, respectively, against front and rear fol- 5olowers 10 and 10, between which is interposed a systemof frictionalelements, hereinafter described, and which in turn bear on frontdraw-bar stops 3d and rear draw-bar stops 3?, secured to the centersills 5. 5 5

In the practice of my invention I provide means for opposing resistanceto the movements of the followers 10 lOfL one toward the other,resultant upon strains of draft and bufflng applied to the draw-bar, byinterpos- 6o ing between them a system of frictional elements comprisinga plurality of outer open or split rings 9, a plurality of inner open orsplit rings ll, and a plurality of annular wedges or wedge-rings 8, saidwedge-rings being interposed between the inner and outer springrings andhaving inclined outer frictional faces which abut against correspondingfaces on the outer spring-rings and inclined inner frictional faceswhich abut against cor- 7o responding faces on the inner spring-rings.The end Wedge-rings, which abut directly against the followers lO 10,are preferably held in position thereon, as by projections 8a formed ontheir outer faces,which engage corresponding recesses in the adjoiningfaces of the followers, or, if preferred, they may be fitted in annulargrooves in the followers, as shown at the right-hand end of Fig. 3., orotherwise. It will thus be seenthat the fric- 8o tional faces of each ofthe end wed ge-rings act upon those of one inner and one outerspringring, and the frictional faces of each of the intermediatewedge-rings act upon those of two inner and two outer spring-rings. Bothfrictional and spring resistance are exerted by the system of elementsabove described when pressurel is imparted to either of the followers 1Q10a, such pressure acting through the wedge-rings 8 upon the openspring-rings, 9o expanding the outer open lspring-rings 9 andcompressing the inner open spring-rings l1,v in which operations a highdegree of frictional resistance is developed by the relative movement ofthe contacting frictional surfaces of the spring-rings and wedge-ringsunder the applied pressure.

The open spring-rings 9 l1 are preferably formed as sections of a helixor with a helical twist or cambcr, as shown in Figs. 7 and 9, in orderthat they may initially exert spring resistance only, by which the minorstrains incident to ordinary train operation may be opposed and theirresultants transmitted to the car-frame through the rings and followerswithout materially involving the exertion of frictional resistance,which is necessary, and is provided for, to counteract shocks andstrains of greater force.

It will be obvious that by the provision of double sets of spring-rings,coincidently acted upon by interposed wedge-rings, as above set forth,the resistant capacity of a draft and bufiing appliance of any desiredand determined dimensions is materially increased above that which wouldbe due to the employment of a single set of spring-rings, as inconstructions heretofore known in the art. It will also be seen thatsuch increase of capacity is attained without necessitating structuralcomplication or the use of parts which are difficult or expensive toform or finish and that the appliance is applicable with as fullreadiness and freedom frompinterference with adjacent members of thecar-frame as are presented in any of the various draftgears which arenow known in practice.

I claim as my invention and desire to sccure by Letters Patentew l. Afriction device comprising two open or split resilient rings, one withinthe other, and an interposed annular wedge or wedgering, said ringshaving inclined, abutting, frictional surfaces.

2. The combination of an outeropen or split resilient ring, an inneropen or split resilient ring, an interposed annular wedge or wedgering,said rings being provided with inclined abutting frictional surfaces,and means for applying pressure and relative movement tothe wedge-ring,thereby generating both spring and frictional resistance in and by theresultant expansion of the outer ring and compression of the inner ring.

3. The combination of two followers capable of relative motion towardand from each other, and an interposed friction device comprising anouter open or split resilient ring, an inner open or split resilientring, and an intermediate annular wedge or wedge-ring, said rings beingprovided with inclined abutting surfaces, which are adapted to be movedin frictional contact in and by the movement of one follower toward theother.

4. In a draft and buffing apparatus, the combination of draft-sills,front and rear draw-bar stops fixed thereto, followers which norm allyabut against the draw-bar stops and are capable of relative movementtoward and from each other, a draw-bar and connected draft-strapabutting on the outer faces of the followers, and a friction deviceinterposed between the followers and comprising a plurality of outeropen or split resilient rings, a plurality of inner open or splitresilient rings, and a plurality of annular wedges or wedgeringsinterposed between the inner and outer resilient rings, and providedwith inclined frictional surfaces arranged to abut against similarsurfaces on the inner and outer resilient rings, and the outer and innerrings having less aggregate width than the distance between thefollowers when the latter are in contact with their stops.

MELVILLE E. DAYTON. lVitnesses:

B. L. CHADWELL, C. A. NEALE.

